X25519 x86_64 assembly final reduction leaves non-canonical field element_CVE-2026-10512

{
    "lastseen": "",
    "description": "The X25519 x86_64 assembly implementation fails to clear the most significant bit during the final modular reduction, so the computed result may not be fully reduced modulo the field prime 2^255 - 19. This can leave the field element in a non-canonical form, producing an incorrect result from the scalar multiplication and potentially a wrong shared secret. The final carry-propagation chains in the x64 and AVX2 reduction routines could overflow into the top bit, and the high limb was not masked afterward, so the 255-bit field element was left non-canonical.",
    "published": "2026-06-25T19:58:16.013Z",
    "modified": "2026-06-25T19:58:16.013Z",
    "type": "cve",
    "title": "X25519 x86_64 assembly final reduction leaves non-canonical field element",
    "source": "wolfSSL",
    "references": "https://github.com/wolfSSL/wolfssl/pull/10536\nhttps://www.wolfssl.com/docs/security-vulnerabilities/",
    "id": "CVE-2026-10512",
    "bulletinFamily": "",
    "cwe": [
        "CWE-682"
    ],
    "cvelist": null,
    "sourceData": "wolfSSL wolfSSL 5.6.4",
    "sourceHref": "",
    "cvss": {
        "score": 2.3,
        "severity": "LOW",
        "vector": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "wolfSSL",
    "version": "5.6.4",
    "vendor": "wolfSSL",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}